If they are black and smooth try it in the ground but dont go deep. Old timere told me that long ago. Cultivator shovels will scour when black as long as they are smooth. Sure wont hurt to plow some to see what happens they could have been coated with something to make them black. Being smooth is whats important. Just remember to not go deep its alway worked for me on a couple of plows. A sanding disc with 120 or so grit will help also you dont want rough or the finish will have marks no cut-off wheels they will leave the surface too rough.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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